The Certis Laser Rangefinding Crossbow Scope by MaxView Optics is the ultimate choice for precise aiming and exceptional clarity. Combining advanced laser rangefinding and state-of-the-art drop compensation, Certis performs flawlessly regardless of conditions.The proprietary drop compensation engine utilizes thousands of calculations based on an arrow's ballistic coefficient. Simply obtain your actual arrow velocity using a chronograph, zero your crossbow at 20 yards and you are set. Fine tune at longer distances. Simple, Easy, Accurate. FeaturesAiming point and arrow drop calculated out to 100 yardsMicro-LED aiming point with multiple brightness settingsFixed Reticle available regardless of conditionsRangefinder measures to 999 yardsMachined aluminum body with integrated rangefinderOLED ultra-bright displayRange targets using Bluetooth wireless remoteGreat battery life with automatic shutoff